To the OP
So far I'm up to 4 "thanks but no thanks emails" without any calls for an interview. I know it has got to suck getting to the interview and then not getting the nod, but keep your head up.
If you're anything like me you don't like talking about yourself and that may be part of the issue.
I signed up for ECI prep and so far it's been worth every penny. I've only done the audio prep so far, but even that was incredibly helpful. The guy that does it is very down to earth and explains things in a way anyone can understand. I cracked up several times listening to it.
Keep your chin up and know that good things are coming your way. Third time is the charm, right?!